A few months ago I started a side project called AgentSkillsHub — a directory that indexes every meaningful open-source AI agent project on GitHub: MCP servers, Claude Skills, Codex Skills, agent tools, the works.

Six months in, the database has 67,196 projects, refreshed every 8 hours.

I expected to find a healthy ecosystem with a long tail. What I actually found was so lopsided I had to stop and write a 12-chapter book about it (free, CC BY-NC-SA, PDF ).

This post is a 1,500-word version. If any of it surprises you, the source data is open and reproducible.

TL;DR (5 findings)

The Gini coefficient of star distribution is 0.983 — more lopsided than the App Store (0.95), npm (0.93), or YouTube (0.87)

54% of all projects have 0 stars.…